Construction of polarization images from a multimod light field camera based on the aliasing model

The multimode light field camera can capture the information of spatial location, spectral and polarization characteristics of target simultaneously. There is aliasing effect of the captured image which will cause that the directly extracted image from a certain filter includes information from other filters. In order to solve this problem, a new reconstruction method for reconstructing polarization images from the captured light field image is proposed along with an aliasing model which describes the pixel response to all the filters. The aliasing model is established by analyzing the imaging principle of the light field system. Then the aliasing coefficient matrix is obtained by calibration experiments. Finally, the images corresponding to the polarization filters are reconstructed. Compared with the conventional directly extracting method, the proposed method can greatly reduce the energy loss, and improve the accuracy of the reconstructed images, which will guarantee the accuracy of polarization information calculation, such as degree of linear polarization and angle of polarization.